cnn's robyn curnow is joining us from johannasberg, south africa. the prosecutor's laid out their plan. how did they do? >> reporter: it was like a roller coaster. i felt like i was watching a television drama. initially when the prosecutor laid out their case, they gave damning evidence and found two boxes of testosterone and syringes in his house. by the time the defense came in after lunch, bit by bit they ripped apart the state's evidence and unravelled quite spectacularly at one stage because there was quite an interesting exchange between oscar pistorius' lawyers and the investigating officer and he said, well, how do you know this is testosterone? have you tested it yet? and he said, no, i just read the label on the box. and he said, if you had gone to any pharmacy or any chemist, would you know that this is a herbal medicine. that's the kind of interchange taking place. also, the investigating officer really looking quite red-faced by the end of his stint. he admitted that he he didn't wear protective foot covers or shoe covers when he he wa